摘要
针对描述弱阴影信道的L~N模型未对模型进行参数估计及实用性验证的问题,对该模型进行参数估计,最后验证模型的准确性和灵活性.首先利用矩估计法估计该模型的参数,并在室内弱阴影散射多径环境下进行体域网实验测量得到原始数据,然后用滑动窗口法从原始数据分离出能够被L~N模型描述的弱阴影衰落测试数据,再利用测试数据计算模型的待估计参数,最后用Matlab计算该模型的统计特性的理论与仿真模型结果,与测试数据计算得到的统计特性进行对比,验证该模型的准确性;通过仿真比较具有相同均值和方差的Lognormal模型和L~N模型(N取不同值)的理论统计特性,验证该模型的灵活性.
Aiming at the problem that nobody estimated the statistical parameters, and verified the practicability of L~N model that describe weak-shadow channel, we estimate parameters of the model and verify the accuracy and flexibility of the model.Firstly, we use the Moment-Method Estimation to estimate the parameters of the model, and the body-area network experimental measurement is performed in a weak-shadow and multipathscatter environment indoor to obtain the original data, and use the sliding window method to separate the test data of weak-shadow fading that can be discribed by L~N model from the original data, and use the test data to calculate the parameters of the model. Then we use the matlab to calculate the statistical characteristics of theory and simulation model of the L~N model, and compare with the statistical characteristics calculated by the test data to verified the accuracy of the model. Finally, we compare the theoretical statistical characteristics of Lognormal model and LN model(with different N values) with the same mean and variance by simulation to verify the flexibility of the model.
引文
[1]Beaulieu N C,Xie Q.An optimal lognormal approximation to lognormal Sum distributions[J].IEEE Transactions on Vehicular Technology,2004,53(2):479-489.DOI:10.1109/TVT.2004.823494.
[2]Guey J,Fitz M P,Bell M R,et al.Signal design for transmitter diversity wireless communication systems over Rayleigh fading channels[C].IEEE 46th Vehicular Technology Conference Mobile Technology for the Human Race,1996:136-140.
[3]石巍,申东娅,孙静,等.基于Nakagami衰落的宽带MIMO信道模型的研究与仿真[J].云南大学学报:自然科学版,2008,30(4):355-360,366.Shi W,Shen D Y,Sun J,et al.Research and simulation of a wideband MIMO shannel model based on Nakagami fading[J].Journal of Yunnan University:Natural Sciences Edition,2008,30(4):355-360,366.
[4]Nakagami M.The m-distribution-A general formula of intensity distribution of rapid fading statistical methods of radio wave propagation[C].W.C.Hoffman ed.Statistical Methods in Radio Wave Propagation,Pergaman Press,New York,1960:3-36.
[5]Tjhung T T,Chai C C.Fade statistics in microcellular mobile radio channels with shadowing[C].IEEE International Conference on Communications Conference Record,Atlanta,USA 1998:1 645-1 649.
[6]Zeremes G,Christodoulou C G.Use of weibull distribution for describing outdoor multipath fading[C].IEEEAntennas and Propagation Society International Symposium,San Antonio,USA,2002:232-235.
[7]Suzuki H.A statistical model for urban radio propagation[J].IEEE Transactions on Communications,1977,25(7):673-680.DOI:10.1109/TCOM.1977.1093888.
[8]Corazza G E,Vatalaro F.A statistical model for land mobile satellite channels and its application to nongeostationary orbit systems[J].IEEE Transactions on Vehicular Technology,1994,43(3):738-742.DOI:10.1109/25.312773.
[9]Karadimas P,Kotsopoulos S A.The weibull-lognormal fading channel:Analysis,simulation and validation[J].IEEE Transactions on Vehicular Technology,2009,58(7):3 808-3 813.DOI:10.1109/TVT.2008.2002697.
[10]Tjhung T T,Chai C C.Fade statistics in nakagamilognormal channels[J].IEEE Transactions on Communications,1999,47(12):1 769-1 772.DOI:10.1109/26.809692.
[11]Wang X,Dubey V K,Ong J T.Simulation of average fading duration using deterministic method[J].Electronics Letters,1999,35(7):542-544.DOI:10.1049/el:19990321.
[12]Yacoub M D.Theα-μdistribution:A physical fading model for the stacy distribution[J].IEEE Transactions on Vehicular Technology,2007,56(1):27-34.DOI:10.1109/TVT.2006.883753.
[13]Yacoub M D.Theη-μdistribution:A general fading distribution[C].IEEE Fall Vehicular Technology Conference In Proceedings,Boston,USA,2000:629-633.
[14]Fraidenraich G,Yacoub M D.Theλ-μgeneral fading distribution[C].Proceedings of the 2003 Microwave and Optoelectronics Conference,2003:49-54.
[15]Yacoub M D.Theκ-μdistribution:A general fading distribution[C].IEEE 54th Vehicular Technology Conference,Foz do Iguacu,Brazil,2001:1 427-1 431.
[16]荣剑,申东娅,孙静.RM陆地移动卫星信道模型[J].云南大学学报:自然科学版,2006,28(6):487-491.Rong J,Shen D Y,Sun J.RM land mobile satellite channel model[J].Journal of Yunnan University:Natural Sciences Edition,2006,28(6):487-491.
[17]Ren W P,An F H,Shen D Y.Research on statistical characteristics for the part-shadowing channel model[C].IEEE Asia-Pacific Conference on Antennas and Propagation(APCAP),Xi'an,China,2017.DOI:10.1109/APCAP.2017.8420349
[18]Shen D Y,Zhang X P.A novel channel model formobile communications[C].IEEE Antennas and Propagation Society International Symposium,Chicago,USA,2012.DOI:10.1109/APS.2012.6347996.
[19]Azmi K H M,Berber S,Neve M J.Channel parameters and distance estimation in wireless sensor networks based on maximum likelihood estimation method[C].IEEE International Conference on Computer&Communication Engineering,2017:400-405
[20]Krylov V A,Moser G,Serpico S,et al.On the method of logarithmic cumulants for parametric probability density function estimation[J].IEEE Transactions on Image Process,2013,22(10):3 791-3 806.DOI:10.1109/TIP.2013.2262285.
[21]秦先祥,高贵,周石琳,等.基于SISE方程的广义gamma分布参数估计方法[J].电子与信息学报,2012,34(8):1 860-1 865.Qin X X,Gao G,Zhou S L,et al.Generalized gamma distribution parameter estimation method based on SISE equation[J].Journal of Electronics and Information Technology,2012,34(8):1 860-1 865.
[22]Greenstein L J,Michelson D G,Erceg V.Moment-metho-d estimation of the rician K-factor[J].IEEECommunications Letters,1999,6(11):1 089-7 798.
[23]Jakes W C.Microwave mobile communications[M].New York:Wiley,1974.
[24]Patzold M,Killat U,Laue F.A deterministic digital simulation model for Suzuki processes with application to a shadowed Rayleigh land mobile radio channel[J].IEEE Transactions on Vehicular Technology,1996,45(2):318-331.DOI:10.1109/25.492906.
[25]Gans M J.A power-spectral theory of propagation in the mobile-radio environment[J].IEEE Transactions on Vehicular Technology,1972,21:27-38.DOI:10.1109/T-VT.1972.23495.
[26]Zhang Q Q,Kasam S A.Finite-state Markov model for Rayleigh fading channels[J].IEEE Trans Commun,1999,47(11):1 688-1 692.DOI:10.1109/26.803503.
[27]Baddour K E,Beaulieu N C.Accurate simulation of multiple cross-correlated fading channels[C].IEEE International Conference on Communications,New York,USA,2002:267-271.
[28]Patzold M,Killat U,Laue F,et al.A new and optimal method for the derivation of deterministic simulation models for mobile radio channels[C].IEEE Vehicular Technology Conference,Atlanta,USA,1996:1 423-1 427.
[29]Nikolopoulos V,Fiacco M,Stavrou S,et al.Narrowband fading analysis of indoor distributed antenna systems[[J].IEEE Antennas and Wireless Propagation Letters,2003,2(1):89-92.
